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Conceitos fundamentais de linguagens de programação

Este documento tem a intenção de apresentar alguns dos conceitos fundamentais que permeiam as linguagens de programação. A ideia é mostrar algumas das principais características e diferenças que existem entre elas, para que dessa forma você possa determinar em que momento é melhor escolher uma dada linguagem em detrimento das outras.

Tradução

Compilador

Uma linguagem compilada é aquela no qual um programa chamado compilador irá fazer uma análise sintática, léxica e semântica de toda a estrutura de um código fonte e o converterá em um novo formato conhecido como código objeto que poderá ser identificado pelo computador.

Book ID	Title	Author	Links
1-A-1	Red Blood and Black Ink: Journalism in the Old West	David Dary	Amazon \|
1-A-2	Media and the American Mind: From Morse to McLuhan	Daniel J. Czitrom	Amazon \| Goodreads
1-A-3	A Social History of the Media: From Gutenberg to the Internet	Peter Burke	Amazon \| Goodreads
1-A-4	Media Technology and Society: A History From the Telegraph to the Internet	Brian Winston	Amazon \| Goodreads
1-A-5	The Television Will be Revolutionized	Amanda D. Lotz	Amazon \| Goodreads
1-A-

Node.js Deployment

Steps to deploy a Node.js app to DigitalOcean using PM2, NGINX as a reverse proxy and an SSL from LetsEncrypt

1. Sign up for Digital Ocean

If you use the referal link below, you get $10 free (1 or 2 months) https://m.do.co/c/5424d440c63a

2. Create a droplet and log in via ssh

I will be using the root user, but would suggest creating a new user

ZSH (using Oh My ZSH) on Manjaro Linux

0. If `ZSH` is not already installed on your Manjaro system you can do it with the command:

sudo pacman -Syu zsh

You do not need to install manjaro-zsh-config and all the other related packages like zsh-syntax-highlighting, zsh-history-substring-search, zsh-autosuggestions, etc., as we will use Oh My Zsh.

StegoPVD

This Tinyscript-based tool allows to apply steganography based on PVD (Pixel Value Differencing) in order to retrieve hidden data from an image.

$ pip install tinyscript
$ tsm install stegopvd

	//! Provide an audio input stream that automatically reconnects when disconnected.
	use cpal::traits::{DeviceTrait, HostTrait, StreamTrait};
	use cpal::{Device, Stream, StreamError};
	use log::{info, warn};
	use simple_error::bail;
	use std::error::Error;
	use std::sync::mpsc::channel;
	use std::thread;
	use std::time::Duration;

	# The next line updates PATH for the Google Cloud SDK.
	source /Users/dwchiang/google-cloud-sdk/path.zsh.inc

	# The next line enables zsh completion for gcloud.
	source /Users/dwchiang/google-cloud-sdk/completion.zsh.inc

	GOVULTR
	VULTRMATCH https://www.vultr.com/match/

	30FREE50V https://www.vultr.com/promo/try50/
	100VULTR30FREE https://www.vultr.com/promo/try100/
	30VULTRONEFIFTY https://www.vultr.com/promo/try150/
	VULTR200FREE https://www.vultr.com/promo/try200/
	FLYVULTR250 https://www.vultr.com/promo/try250/
	GIVE100GET35
	GIVE100GET25 invalid

	# crystal build foo.cr --release
	# ./foo 37.7749 -122.4194 34.0522 -118.2437
	#
	# Around 0.08s.

	module GeoCalculator
	EARTH_RADIUS_IN_KM = 6371.0

	def self.distance(lat1, lon1, lat2, lon2)
	dlat = lat2 - lat1

	Github.com ui .currently does not natively supoport search for multiple topic tags as of now. However their api allows you to query multiple tags. Below is a simple example to query github.com with ecs and go topic tags.

	curl -H "Accept: application/vnd.github.mercy-preview+json" \
	https://api.github.com/search/repositories?q=topic:ecs+topic:go

	Response from the github can be rather verbose so lets filter only relavant info such repo url and description.

	curl -H "Accept: application/vnd.github.mercy-preview+json" \
	https://api.github.com/search/repositories\?q\=topic:ecs+topic:go \| jq '.items[] \| {url:.url, description:.description}'